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  The center-surround effect in visual speed estimation during walking

Chuang, L., Bülthoff, H., & Souman, J. (2011). The center-surround effect in visual speed estimation during walking. Poster presented at 34th European Conference on Visual Perception, Toulouse, France.

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Chuang, L1, 2, Author              
Bülthoff, HH1, 2, Author              
Souman, J1, 2, 3, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497806              

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 Abstract: Walking reduces visual speed estimates of optic flow (Souman et al, 2010 Journal of Vision 10(11):14]. Simultaneously, visual background motion can influence the perceived speed of moving objects (Tynan and Sekular, 1975 Vision Research 25 1231–1238; Baker and Graf, 2010 Vision Research 50 193–201). These two effects have been attributed to different subtractive processes, which may help in segregating object motion from self-motion induced optic flow. Here, we investigate how both factors jointly contribute to the perceived visual speed of objects. Participants compared the speed of two central Gabor patches on a ground plane, presented in consecutive intervals, either while standing still or while walking on a treadmill. In half the trials, one of the Gabors was surrounded by a moving random dot pattern, the speed of which matched walking speed. Our results replicated previous findings. A moving surround as well as walking can independently induce a subtractive effect on the perceived speed of the moving center, with the effect size increasing with center speed. However, walking does not affect visual speed estimates of the center when a visual surround is present. These results suggest that the visual input dominates the segregation of object motion from background optic flow.

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 Dates: 2011-09
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: ChuangBS2011
DOI: 10.1177/03010066110400S102
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Title: 34th European Conference on Visual Perception
Place of Event: Toulouse, France
Start-/End Date: 2011-08-28 - 2011-09-01

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Title: Perception
Source Genre: Journal
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Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 40 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 129 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369